Green salt isn't something you'd want to sprinkle on French fries. It's what nuclear chemists call uranium tetrafluoride, a grainy substance that can be used to make fuel for a nuclear reactor or fissile material for a bomb. In short, it's scary stuff, which is why the International Atomic Energy Agency (IAEA) confronted Iran late last month about a secret Iranian research effort called the Green Salt Project. Iran has long maintained that it wants to enrich uranium to generate nuclear power, not to make a bomb. But disclosure of the project--and its apparent links to the testing of high explosives--seems...
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